Start GTD with a mind sweep
When people start out with GTD I think they get overwhelmed because they’re expected to go from no, or unproductive organization to writing everything down, categorizing and dealing with stuff. A method I read about on Stuff for Getting Things Done is very much like what I first did when GTD hit me.
The point of doing a mind sweep is to let everything transfer itself from your head, down onto paper, or on to the screen. On one hand, this will let you organize the most data you have, so you can create your GTD system fully, but on the other hand it also gives you clarity of thought and a warm fuzzy feeling that you’re not going to forget anything, since it’s down on paper.
I would actually recommend doing a mind sweep every now and again, say monthly, it would be the equivalent of reaching into the corners of the room when cleaning. You do take down your thoughts regularly, just as you also clean, but now and again it may prove effective to reach into the corners of your mind to get at those hidden thoughts.

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